Cutter feeding device



J. W. BOE'NING CUTTER FEEDING DEVICE July 27, 1943.

Filed Nov. 23, 1942 2 Sheets-Sheet 1 8 INYENTOR.

MIA/n8) my ATTORNEY July 27, 1943. J. w. BOENING 2,325,364

CUTTER EE DING DEVICE Filed Nov. 25, 1942 2 Sheets-Sheet 2 INVENTOR.

/M 6m BY 7%. XMZ/ ATTORNEY Patented July 27, 1943,

Unite! STATES PATENT Q'EFICE 1 I 2, 325,36f1- "1'. H qmee rhlimhe'niavioii i I Y Joseph WBoening, Inglewood, Calif.-

e eii ee n November 23, 1942, Serial No. tsetse solai' s. (01;51+219) l The present inven ion rel tes he elly e wha is commonly kn wn as .a. em tin natu e the purpose of which is to uid he tee he he; ere, i duringt r nding operati n, -.T .:et particlelarly the pr sent inven ion is a hand perat d fixture adapted to. be mount d a gr ndin peration, o h end that uhi e mityes o ,rh :3

time. cutting ed s w l resu t v A furth r ohie is he pr is on of a gr nding fixture which may be quickly and easily adjusted to work in hand, Whether oneor multiple outting ed es, by mea s of eX' erhal adjustments of a sim e c racter, nd wit h t e ork m y be readily assembled and disassembled at the start and finish of the operation. H

Grinding fixtures of the present eharacter are conce ed n gen al. with e s peni or the utt edges o t olsz th as ri s e det boring or burring cutters aswell as countersink cutters, both. right and left hand integral pilot counter sinks, center drills and other types of small cutters, requiring that relieving or ba'eking off be accomplished to remove metal of the too! behind its cutting edge or'edges in order to :pro, vide clearance. a

The foregoing nei ehy he ehi et -efth invention will clearly appearin the course oftl e following description in detail of the be st "struc tural mode thus jar devisedtfor carryingthe in;-,

vention into praeticaleifeot, and by reterenceto the accompanying drawings forming a partof. this specification, and in which, l a

Fig. l is a side elevation of the complete device.

Fig. 2 is a horizontal sectional iew taken subtstantially on an axial line. through the arbor housing along the 1ine2 2 of.

Fig. 3 is a front elevation.

4 is a'vertical transverse sectional View taken substantiallyion line d fofl ig. 1; v s

Fig. ,5 is a top plan view of the forward portion of the arbor housing showing the linear stroke adjusting m a s f. e arbor, and. t

Big, 6 is a ertiealtransverse sectional View a n Sub an a ly h li e 5+6 through h eth r in m ene- Referring now to the above described figures 9 h r w ngs an pew wl y' tees. l e 3 inc usive. a h n al! e lihdriea arbor h ing l0 iormsa support therein fora slidablyand .rotatably interfitting eylindrioal arbor H in the ie w rdeh o which s e hhl ew ax shi ehle but nonerotatable collet 1;. This collet is con; l ed and ma p a ed byehe e dra-w er 13 with the rear portion of the arbor ,the aches .eent ends of the draw bar and collethayinfg relative y nga ing threaded e at (4 hereby etation of the-draw bar in one direction, while the arbor H is held against rotation, causes the cpllet to be shifted inwardly or rearwardly relae tive to the arbor for gripping the work. as for example atwist drill as seen at'A in Fig. 2,

o he abo e pu o es he ee e i may be e the we khew sp it spr ng t ne, t e -fe we d. e ernal 11056 p rtion eh e e ne en a tape mat ng he t ered .ie w 'rde d w the b r o ar or H. h iy's i ahle' pl he, a a IT,

m ylserve o permit reletiveleh thwi o axi l mo e of he" eellet whil e en n i s ele'e tive t' "The f rward] ehd ear ends of the a u l extend be ond the s ec i e end 1 housing 0 nd th ree werdl rojectin end t ereof pre e eb y-te eredto mete tne'tener d s e h -en nnu ar shoulder 8 r u d the .re tq y' proi ee he hd o w b r 3. adiee ht to its" rear rm'he h nd whe l "H1 hav arearwardly irojectihghahdleifi,

r A reenter ousi g in; hem tite-1e;

e has .f r i st ppert 2 dep ding brack stem 2| which. with a lower horizontal disc 22, forms a supporting pedestal seatedonthe upper ei eu r a f rm 23 o a bas m mbe whi also includes a flanged bottom portion 24 havin s rew or. bol op in s and depend n ten h 25h e hereu te me n o anch rin t e Same solidly on a grind r frame or table. The .p ti rrn 23 is annu e yhahh etedlih he d rees 'P eircle fromja z o neiht s en n Fi and t e lowe di ZZlhas e in ex-mint eeenere ne ,withthe calihrete plelt eirm and e eexitre e mg to recei e the th aded beltt uhstehdihe from t e b se b r! A nut '2 h 'seid' elt s s as a meenstee eih the diet 22; and

' ee Y he erb housing; at various angles h p lfl nd des abl d xing he: fixture and the work cerriee h rehmih res ect o the grinder. .o I i -I ord r to leek the ether H, against rotation while the draw bar is rotated to clamp the work by rearward movement of the collet l2, a latch pin 28 is vertically shiftably mounted in a tubular case 29 threaded into the top portion of the'housing l intermediate its ends. This latch pin actuated by a spring 30 is engageable at its lower end, in a slotted opening 3| of the arbo-r, as seen in Fig. 6, when work is inserted and clamped. Thereafter, the arbor H engaged at its forward end by the collet and at its rear end bythe draw bar, may be rotated in the housing ID, by the hand wheel l9 after th latch pin 28 has been twist drill, all but two abutment screws 44 will be shifted forwardly out of operative position and out of action, leaving two diametrically opposed screws in position so that the cam surface will be formed by adjusting cam ring 48 to a lateral incline for almost one-half of its circumference. This extent of cam surface is gradually reduced as the number of cutting edges increases and the number of abutment screws in effective raised to released position and partially turned so that the diametrically opposed ribs 3! beneath its upper exposed head 32 rest on the upper edge" or operative position correspondingly increases.

In, operation as eachabutment screw 34 rides the cam surface of ring 4E2, the arbor H, and the collet and draw bar in clamped engagement therewith, are shifted forward during rotation by meansof the hand wheel I9. This forward "movement is gradual so as to present more and more of the clamped tool against the grinding surface for the removal of more and more metal It will be noted in Fig. 2 that the rear end of the housing [0 is counter-boredto receive therei in a coil' spring 34 around the rear portion of arbor H and to form a shoulder constituting an abutment for the forward end of said spring.

The rear end of the spring isengaged by a collar adjustably fixed by a set screw 35, to the rearwardly projecting rear end portion of the arbor, the setgscrew being fixed through a knurled flange 31 'of the collar.; Thus, the effective tension of spring 34 may be governed to properly elastically hold the arbor'at the limit of its rearward sliding or'linear movement relative to the housing I0.

' At its'forward end housing it is reduced externally, providing an annular seat for an adjustable cam holding ring 33 which is secured thereto by a set screw 39. Against-theforward surface of this ring 33, a split spring ring 4i} is ring 38, the forwardly projecting forward end portion of the arbor H has an annular flange "53 of substantially;the d-iameter of the'cain ring 28 and opposing the'latter. Threaded through the flange "43 at equidistantly' spaced points 'therearound, screws 44 whose forwardly 'projectingends receive lock nuts 45"which engage the flange to lock the screws'in adjusted positions. Therear ends of'these screws 44 have hardened ball ends to ngage the cam ring to and, while a series of six such screws are shown (see Fig. 3) it is ob;- vious thatanyfone or more of the screws may are axially v disposed." abutment as a relief or back off behind the cutting edge. This movement is, moreover, against the tension of the return spring 34 and when the abutment screw, riding thecam, reaches the cam end and drops therefrom, th spring Bfi immediately returns the arbor to its rearmostnormal position for'the grinding of the next'cutting edge,

It "is apparent fromthe foregoing that after the tool A is clamped inlthe collet with th latch pin 28 holding the arbor H against rotation as described, the arbor I, collet l2 and draw bar I3 are frictionally gripped to rotate and. axially shift as a unit in the arbor housing, as soon as the'latch pin is released. Rotation of these parts through a full revolution is by manual power through the hand wheel Hl'and during this rotation th rotating unit is gradually shifted'ior- 'wardly as each abutment-screw rides the cam formed; by the cam ring, and then abruptly shifted rearwardly as such abutment screw drops from thecarn. At the end of the operation the latch pin is again dropped to lock the arbor and by then rotating the draw barto the left, the collet maybe releasedand the finished tool withdrawn.

Obviously since the'cam ring can be adjusted to present either'a right-hand or left-hand cam,

and'the unit formed by the arbor, collet and draw bar'when clamped 'to one'another, may be rotated either right or left, it is possible to grind toolshaving either right or left hand cutting edges. 3 With the present toolholding fixture, various tools may be effectively, quickly and uniformly'ground, having from one to'six cutting edges, but no limitation is to be imposed on the number of edges except within the limits of the number of abutment "screws 44 and cam ring adjusting screws 42 which may be effectively utilized." I

While I have illustrated and described what I nowreg'aid as the preferred embodiment of my invention, thefconstructio'n is, of course, subject to 'inodificationsf without departing from the *spili; and scope of my invention. "I, therefore,

, do not wish to restrict'myself to the 'particuJar readily be" shifted forwardly and out of effective control position depending upon the number of "the collet since an abutment screw for each-tool edge must dropoff of the cam of ring. 40 before the screw controlling the back off or relief of the succeeding cutting edge, rides .the cam. 'Thus, if

there are but two cutting'edges as on'the usual 7 cutting edges of the toolsupported for'grin'dingv form oil-construction illustrated and described,

but desire to avail myself of all modifications that may falliwithin the scope of the appended claims.

Having thusdescribed my invention, what I claim and desire to secureby Letters Patent is: A 1. A tool holding grinding fixture, including an arbor housing, an arbor rotatable and axially shiftable in said housing; means for rotating the arbor, a tool holder carriedby the arbor and movable'therewith, cam means effective to shift the arbor and tool holder axially in onedirection during rotation of the arbor, and'a return spring engagingthe arbor for continuously urging the same in the opposite direction, said cam means including an adiust'ably deformable split cam ring on the arbor housing, and cam engaging members carried by and around the arbor in spaced relation, the said cam engaging members being slectively shiitable into, and out of, effective position. I

' In a grinding fixture, an arbor, a tool holder carried thereby, a support in which said arbor is mounted to shift lengthwise and rotate, gmeans for rotating said arbor, spring means constantly urging said arbor to shift in one direction, and

relatively engaging members carried by the arbor and support for shifting the arbor in the opposite direction, one or said members being an adjustably deformable cam ring and the other member including an annular series of selectively positionable cam engaging abutments.

3. In a grinding fixture, an arbor, a tool holder carried thereby, a support in which said arbor is ing shifting movement of the arbor in one direction, a split spring ring around an end portion ofsaid housing, means supported by the housing for holding and adjustably deflecting portions of said ring to cam shape, and a series of cam engaging elements spaced around the arbor and supported thereby opposite said ring, each of said elements having adjustable into and out of abutting engagement with the ring.

5; In a tool holding grinding fixture, a support,

' an arbor rotatable and axially shiftable through mounted to shift lengthwise and rotate, means i for rotating said arbor, spring means constantly urging said arbor to shift in one direction, and

relatively engaging members carried by the arbor and support for shifting the arbor in the opposite direction, one of said members being a split flexible cam forming ring and means for selectively flexing said ring to vary cam contour, and

the other member including an annular series of cam engaging abutments, each of said abutments said support,'means for manually rotating said arbor, tool holding-means carried by the arbor, spring means for shifting the arbor in one direc' tion, and cam means for shifting the arbor in the opposite direction, including a split spring ring around a portion of said support, means for holding and deflecting portions of said ring to form a stationary cam, and a series of cam engaging elements carried by and around the arbor, each of said elements being manually adjustable into and out of effective engagement with said cam ring.

JOSEPH W. BOEN'ING. 

